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Re: [ippm] [EXTERNAL] Demo: IOAM Ping using ICMPv6 Loopback

"Overcash, Michael (CCI-Atlanta)" <michael.overcash@cox.com> Thu, 18 April 2024 12:44 UTC

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From: "Overcash, Michael (CCI-Atlanta)" <michael.overcash@cox.com>
To: Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [EXTERNAL] [ippm] Demo: IOAM Ping using ICMPv6 Loopback
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Subject: Re: [ippm] [EXTERNAL] Demo: IOAM Ping using ICMPv6 Loopback
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Very cool. Can you add an option to display the DSCP value and ECN bits as well? That would be very valuable in troubleshooting issues related to DSCP and/or ECN bleaching.

--
Michael Overcash
Cox Technology, CPE Engineering

-----Original Message-----
From: ippm <ippm-bounces@ietf.org> On Behalf Of Tal Mizrahi
Sent: Thursday, April 18, 2024 5:09 AM
To: IETF IPPM WG <ippm@ietf.org>
Subject: [EXTERNAL] [ippm] Demo: IOAM Ping using ICMPv6 Loopback

Hi,

We have recently proposed ICMPv6 Loopback, a new ICMPv6 type which is similar to ICMPv6 Echo, except that the Loopback reply includes the
IPv6 header, extension headers and IPv6 payload of the corresponding Loopback request.
https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-mcb-intarea-icmpv6-loopback/__;!!Hit2Ag!0auFUzR3u9l5zYXe2X0GPpyX6F7zZ1d6xdKt-2MVX0OJGPeFPyRKNk_Jzv6eexk554ZRuqTpDEWGf-7iY36-pmlln36cEA$ 

In the context of IOAM this means that an IOAM encapsulating node can send an ICMPv6 Loopback request that includes an IOAM option, and the Loopback reply includes the IOAM data of the request. This can be used, for example, in a Ping-like application.

We have prepared a demo which leverages the existing IOAM implementation in the Linux kernel, and uses ICMPv6 Loopback in order to implement a Ping-like utility that presents the IOAM data of the nodes along the path.

An example of the output of IOAM Ping with two IOAM nodes is shown below, with three data fields per hop (Hop limit/node id, timestamp seconds, timestamp fraction).

PING db01::1 (db01::1) 56 data bytes
152 bytes from db01::1: icmp_seq=1 ttl=64 time=0.192 ms IOAM:
NodeID=1,HopLim=64,RcvTime=NA
NodeID=2,HopLim=63,RcvTime=1712811441.126
152 bytes from db01::1: icmp_seq=2 ttl=64 time=0.078 ms IOAM:
NodeID=1,HopLim=64,RcvTime=NA
NodeID=2,HopLim=63,RcvTime=1712811442.129

The demo is available at:
https://urldefense.com/v3/__https://github.com/talmi/IOAM-Ping-Demo__;!!Hit2Ag!0auFUzR3u9l5zYXe2X0GPpyX6F7zZ1d6xdKt-2MVX0OJGPeFPyRKNk_Jzv6eexk554ZRuqTpDEWGf-7iY36-pmm0hNUoDA$ 

Feedback about ICMPv6 Loopback and about the Ping demo will be welcome.

Thanks,
The authors.

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